Question

How do you tokenize when you read from a file in C?

textfile:

PES 2009;Konami;DVD 3;500.25; 6

Assasins Creed;Ubisoft;DVD;598.25; 3

Inferno;EA;DVD 2;650.25; 7

char *tokenPtr;

fileT = fopen("DATA2.txt", "r"); /* this will not work */
  tokenPtr = strtok(fileT, ";");
  while(tokenPtr != NULL ) {
  printf("%s
", tokenPtr);
  tokenPtr = strtok(NULL, ";");
}

Would like it to print out:

PES 2009

Konami

.

Answer 1

try this:


main()
{
    FILE *f;
    char s1[200],*p;
    f = fopen("yourfile.txt", "r");
    while (fgets(s1, 200, f))
    {

while (fgets(s1, 200, f))
{

    p=strtok(s1, ";
");

    do
    {
        printf ("%s
",p);
    }
    while(p=strtok(NULL,";
"));
}


}

the 200 char size is just an example of course

Answer 2

You must read the file content into a buffer, e.g. line by line using fgets or similar. Then use strtok to tokenize the buffer; read the next line, repeat until EOF.

Answer 3

strtok() accepts a char * and a const char * as arguments. You re passing a FILE * and a const char * (after implicit conversion).

You need to read a string from the file and pass that string to the function.

Pseducode:

fopen();
while (fgets()) {
    strtok();
    /* Your program does not need to tokenize any further,
     * but you could now begin another loop */
    //do {
        process_token();
    //} while (strtok(NULL, ...) != NULL);
}

Answer 4

Using strtok is a BUG. Try strpbrk(3)/strsep(3) OR strspn(3)/strcspn(3).

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